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Income Taxes (Narrative) (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2017 | Mar. 31, 2017 | Jul. 01, 2016 | Jun. 30, 2017 | Jul. 01, 2016 | Jul. 01, 2016
Income Tax Contingency [Line Items] |  |  |  |  |  |
Effective income tax rate (percent) | 30.40% |  | 31.00% | 29.20% | 26.50% |
Release of valuation allowance |  |  |  |  | $ 11,200,000 |
Income tax benefit | $ 38,767,000 |  | $ 31,870,000 | $ 79,820,000 |  | $ 66,418,000
Decrease in uncertain tax positions |  |  |  | $ 11,000,000 |  |
Foreign Affiliate |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Income tax benefit |  | $ 3,300 |  |  |  |
Foreign Tax Credits and US IRC section |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Income tax benefit related to an amended tax return to claim additional benefits |  |  | 5,700,000 |  |  |
Income tax benefit offsetting of unfavorable in return to accrual adjustments |  |  | 8,800,000 |  |  |
Income Tax Reserve Release Due to Expiration of Statute of Limitations |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Favorable income tax reserve due to expiration of statute limitations |  |  | $ 4,500,000 |  |  |

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